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PDMS Microlenses for Focusing Light in Narrow Band Imaging Diagnostics

Journal Article (2019)
Author(s)

Adriana C. Costa (Chongqing Technology and Business University, University of Minho)

Sara Pimenta (University of Minho)

João F. Ribeiro (University of Minho)

Manuel F. Silva (University of Minho)

Reinoud F. Wolffenbuttel (TU Delft - Electronic Instrumentation)

Tao Dong (University of South-Eastern Norway, Chongqing Technology and Business University)

Zhaochu Yang (Chongqing Technology and Business University)

José H. Correia (Chongqing Technology and Business University, University of Minho)

DOI related publication
https://doi.org/10.3390/s19051057 Final published version
More Info
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Publication Year
2019
Language
English
Issue number
5
Volume number
19
Article number
1057
Pages (from-to)
1-11
Downloads counter
334
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Institutional Repository
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Abstract

Minimally invasive medical devices can greatly benefit from Narrow Band Imaging (NBI) diagnostic capabilities, as different wavelengths allow penetration of distinct layers of the gastrointestinal tract mucosa, improving diagnostic accuracy and targeting different pathologies. An important performance parameter is the light intensity at a given power consumption of the medical device. A method to increase the illumination intensity in the NBI diagnostic technique was developed and applied to minimally invasive medical devices (e.g., endoscopic capsules), without increasing the size and power consumption of such instruments. Endoscopic capsules are generally equipped with light-emitting diodes (LEDs) operating in the RGB (red, green, and blue) visible light spectrum. A polydimethylsiloxane (PDMS) µ-lens was designed for a maximum light intensity at the target area of interest when placed on top of the LEDs. The PDMS µ-lens was fabricated using a low-cost hanging droplet method. Experiments reveal an increased illumination intensity by a factor of 1.21 for both the blue and green LEDs and 1.18 for the red LED. These promising results can increase the resolution of NBI in endoscopic capsules, which can contribute to early gastric lesions diagnosis.